chore(package): update file-loader to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "coveralls": "^3.0.9",
     "css-loader": "^3.4.2",
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
-    "file-loader": "^5.0.2",
+    "file-loader": "^6.0.0",
     "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.2.0",
     "http-server": "^0.12.1",